Fbancis a



(No MbdeL) P. A. GRATER.

WINDLASS.

Pat ted A IN V ENTER WITNEEE EEI.

% Nrrnn STATES PATENT Erica.

WlNDLASS. h

SPECIFICATION forming part of Letters Patent No 296,161, dated April 1, 1884.

Application filed January 9, 1884. (X0 model.)

such as will enable others skilled in the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to letters or figures of reference" marked thereon, which form a part. of this specification.

My invention relates more particularly to ships windlasses; and it consists, essentially, in interposing a friction -block between the toe end of a common brake-lever and the periphery or driving-face of a Windlass-wheel, in combination with arecessed jacket or clamp adapted to receive and retain said block and lever, whereby pressure or force being imparted to the lever is distributed over the larger surface of the block and wheel-face, all as will be more fully hereinafter set forth.

In the accompanying sheet of drawings, Figure 1 represents a partial end view of a pumpbrake Windlass, showing awheel secured to the main shaft and provided with my improved brake-lever clamp, the front portion of the latter being removed. Fig.2 represents a horizontal section through the center of the same.- Fig. 3 represents the lever disengaged from the friction-block, corresponding to the downstroke. Fig.4 represents a perspective view of the friction-block itself. Fig. 5 represents the same having a roughened or serrated friction-surface. Fig. 6 represents the friction-block as mounted upon a pivot secured to the clamp. Fig. 7 represents my improvement as adapted to be used with a modified form of driving-wheel, the levers in this case being parallel with the Windlassshaft.

The object of my invention is to provide a stronger, safer, and more reliable means for operating windlasses or other analogous machines which employ friction-levers pivoted to clamps, the latter adapted toembrace the rim or other suitable portion of the wheel.

I have selected certain portions of a pump brake Windlass, as commonly employed on shipboard for hoisting anchors, as best adapted to exhibit my invention, although I do not limit myself to such combination.

The following is a description of my inven tion and the manner of operating the same.

B represents, in the drawings, a Windlassshaft having secured thereto the wheel A, pro vided with peripheral flanges a and ratchet a, as common.

H represents a side bit adapted to support the Windlass, and secured to the deck K.

0 represents a clamp, so-ealled, consisting of two parts adapted to be bolted or secured together by bolts 8. Said clamp is pro vided with the inwardly-projecting flanges 0 (see Fig. 2,) as common.

0 represents a chamber or pocket formed within the clamp, and extending partially through and across the same, as fully shown.

D represents a block, of suitable material, adapted to loosely fill said cavity C the inner or concave surface of the block being further adapted to engage with the periphery of the wheel.

E represents a lever, pivoted to the clamp O at s, and provided with the toe e and eye 15', as common.

It is now evident that the beam of a pump brake Windlass having the connection t attached thereto, and its lower end being attached to the outer end of the lever E, and moving in the arrow-direction of Fig. 1, will force the toe end e of said lever against the back of the friction;block D, the face 02 of the latter at the same time frictionally engaging with the surface of the wheel A, which, in combination with the flanges G" of the clamp O, revolves the Windlass ahead, all as fully shown. By depressing the lever E, as shown in Fig. 3, the clamp, 850., are allowed to slide partially around the wheel, preparatory to obtaining a new grip or bite.

In Fig. 7 my invention is represented as applied to two sides of awindlass-wheel at once, whereby one wheel serves the purpose of two wheels, as required in the former case. I however make no claim to this double form of wheel, but to show the adaptation of my invention therewith. In Fig. 6 the block D is loosely pivoted at d to the clamp 0, resulting, however, in slightly reducing its area of frictional contact with the wheel A. The clamp 0, minus the pocket 0 and block D, in combination with the friction-lever E, is an old and well-known device; but when so used the toe e of the lever soon upsets, and at the same time the amount of its surface in contact with the wheel is very limited. Moreover, should the edge of the wheel become accidentally oiled or greased, the toe will slip under heavy pressure and not hold properly when brought in contact with such oiled surfaces, whereas it has been practically demonstrated that by the interposition of my improved friction-block D all the foregoing disadvantages are overcome.

I do not claim, broadly, as my invention, a block or shoe adapted to be interposed between the lever and a flanged wheel, as such parts having a peculiar form have been used before.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is 1 The combination, in the clamp 0, provided with a pocket or recess, 0 of the friction-block D and lever E, all arranged and adapted to be secured together substantially 30 as shown and set forth.

2. The combination, with a Windlass provided with one or more chain-wheels and dn'ving-wheels, of the friction device herein escribed, adapted to engage with said driving. wheel, and consisting of the recessed or aper- 3 5 tured clamp O, leverE, and friction-block D, substantially as shown and set forth.

3. The combination, with a Windlass provided with a double-faced wheel, A, of the clamps 0, having pocket 0 lever E, and fric- 4o tion-block D, the latter being interposed between the toe of said lever and the drivingface of the wheel, substantially as shown and set forth.

4. The friction device herein described, con .15 sisting of the recessed or apertured clamp O, lever E, pivoted to said clamp, and frictionblock D, the latter being pivoted at d within said recess, the whole combined, arranged, and adapted to engage with the driving-wheel of 50- a Windlass or machine, substantially as shown and set forth.

In testimony whereof I have affixed my signature in presence of two witnesses.

FRANCIS AI GRATER.

Witnesses:

GEO. II. REMINGTON, WM. 1%. DUTEMPLE. 

